Furnaces.



. J. BAGOT.

FURNACE.

APPLICATION man MAR. 24; 19u.

Patented Sept. 3,1918.

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the inclined surface to WILLIAM J'. lBAGrOT, OF BRIDGEWATER,

MASSACHUSETTS, ASSIGNOR TO THE STANLEY WORK-S, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

FURNACE.

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Specification of Letters Patent.

Patented Sept. 3, 1918.

Application led March 24, 1917. Serial N o. 157,255.

To all whom t may concern:

Be it known that I, WILLIAM J. BAGOT, a citizen of the United States, residing at Bridgewater, in the county of Plymouth and Commonwealth of Massachusetts, have invented a new and useful Improvement in Furnaces, of which the following, together with the accompanying drawings, is a specification.

The present invention relates to improvements in furnaces, and more particularly is concerned with furnaces employed for heating metal billets or ingots. In such furnaces it is customary to pass the billets or ingots side by side through the heating chamber, each billet or ingot being delivered broadside at the discharge end of the furnace where it is permitted to pass by gravity down an inclined surface and is thence conveyed away for further operations thereon while in its heated condition. Such a furnace, in which is contemplated the gravity discharge of billets or ingots, is shown, for example, in the United States Letters Patent to Morgan, No. 632,020, issued August 29, 1899; in said patent the gravity discharge of the billetsis availed of to accelerate their .movement in passing from the Zone of maximum heat in the furnace through the space of reduced temperature intervening between said zone and the delivery opening of the furnace. In other furnaces,\however, such a gravity discharge is availed of simply to facilitate the removal of the billets from the furnace, without especial reference to the temperatures existing at the point of discharge, and obviously my invention, which relates particularly to the construction of effect such a gravity discharge, is not limited to any particular @type of furnace, but is applicable topany furnace in which the gravity discharge of the billets, for any purpose whatsoever, is availed of.

It has heretofore been the practice to employ a heat and wear resisting brick, such as chrome brick, for the construction of the inclined surface down which the heated billets roll or slide in such furnaces. However, owing to the intense heatpand to the continuous pounding .which such a surface receives from the descending billets, the life of the bricks employed for such a surface is'exceedingly short, and thus frequent and expensive replacements have been necessary.

,which is retained in 9, and their upper ends The present invention resides in the provision of such a surface capable of withstanding for an indefinite period the intense heat and continuous heavy pounding of the descending billets thereon, as will be more full set forth in the following description, re erence being had in this connection to the accompanying drawings, in which- Figure l is a fragmentary view, partly in section illustrating the construction of an inclined gravity discharge surface for a. billet heating furnace, according to my invention, and

Fig. 2 is a face view, partly in section, of the inclined surface shown in Fig. l.

Fig. 3 is a sectional view of the members ll, ll, taken upon a plane at right .angles to the section shown in Fig. 1.

Like reference characters refer to like parts in both figures.

In the particular form of furnace shown in Fig. l, the billets l, l are progressively moved broadside in a row over the usual supporting skids 2, and in this way are passed through the heating chamber of the furnace which is inclosed by the roof 3. In this fashion the billets are carried successively across a hearth 4, the surface of which, preferably of brick, is supported on a transversely extending cast iron shelf 5 place by bracing members ll, as hereinafter described. The hearth 4lsupports the billets just previous to their gravity discharge from the furnace, each billet being pushed broadside over the edge of said hearth, whence it descends by gravity over an inclined surface, constituted in part by said bracing members, as hereinafter described, and extending, roughly, from the shelf 5 to the transverse beam 7, the latter being embedded in the brickwork of the furnace and spaced a suitable distance above the floor level 8.

The beam 7 is preferably of cast iron, and is made hollow for the circulation of cooling medium therethrough. On its upper surface the beam 7 supports a cast iron sill 9, bolted or otherwise secured thereto and extending the full width of the discharge opening l0. The spaced cast iron bracing members l1, resting on brickwork 6, have their lower ends in abutting relation to sill have rearwardly projecting tongues l2, in supporting relation to the shelf 5, and received thereby above a transverse ledge 13 on its under side, to brace and retain said shelf in the position shown. The lower ends of members 11 are supported on beam 7 and have forwardly projecting tongues 111- which are overlapped by the rear portion 15 of sill 9. In this way the several members 11 are supported in an inclined position, as shown, to bridge the space between shelf 5 and sill 9, the upper surfaces of said members meeting the rear .edge of sill 9, as shown in Fig. 1.

On opposite sides thereof the members 11 have laterally extending flanges 16, which are utilized for the support of a plurality of cast iron blocks, adapted to lill the spaces between members 11 in the manner hereinafter described, said blocks having their upper surfaces substantially flush with the upper surfaces of the members 11. In the assemblage of the structure, a row of blocks 17 is disposed adjacent the sill 9, and supported by the flanges 16 of members 11. `Each block 17 is made hollow, and has side openings 1S, 18 and a topopening 19 from its interior. All the members 11 are made hollow, and each has openings 20, 20 near its lower end in registration with the side openings 18, 18 of the interposed lower row of blocks 17, so that communication is established between the interiors of all of said blocks and the interiors of all of said members. The member 11 atl one end of the structure is adapted to have its eXterior opening 2O connected to a blast supply pipe 21, through which is forced a current of air from a pump or compressor, not shown.

Disposed in a plurality of rows above the block 17, and also supported on the flanges 16 of members 11, are the hollow blocks 22, each having upper and lower openings 23 and` 2f-l for registration with the adjacent openings of the blocks immediately above and below the same. Above the row of blocks 22, 22 are disposed an upper row of hollow blocks 25 which are flush with the underside of shelf 5, and have openings 26 to communicate their interiors with the blocks 22 immediately below. In this way communication is established between all the blocks 17, 22 and 25 and all the members 11 of the structure, the hollow spaces of all of said blocks and of said members being supplied with air, or other cooling medium, from the pipe 21. This air, or other cooling medium, is permitted to escape through a plurality of small holes 27 in the members 11, and a plurality of small holes 28 in the blocks which are interposed therebetween, such holes, as herein shown, being provided in all of said blocks except the row of lower blocks 17, but obviously the disposition and arrangement of said holes may be varied at will to suit the particular requirements of operation. The air, or other cooling medium, is thus allowed to escape,

more or less heated, over practically the entire surface constituted by the hollow members 11 and the hollow blocks 17, 22 and 25, thus keeping the inclined surface over which the billets pass in a sufliciently cooled condi,- tion to prevent its destruction by the intense heat and continuous pounding of the billets thereon. The shelf 5 is also made hollow, as shown in Fig. 1, for the circulation of air, or other cooling medium, therethrough, the same escaping through apertures 29 in the face of the-shelf over which the billets pass. If desired, the registering openings 1S and 20 of blocks 17 and members 11, and also the registering openings 19, 23, 24 and 26 of the several rows of blocks may be provided with suitable matching annular recesses and projections, V as shown in Fig. 2, to reduce the leakage of cooling medium, and to insure its uniform distribution to all parts of the surface formed by said members and said blocks.

The members 11, in' addition to forming a practically indestructible surface for the gravity descent of the billets, brace the shelf 5 rmly in position. This shelf, which supports the hearth 45, has a projecting lip 30 which retains the brickwork of said hearth in place, and prevents the latter from being' broken up and pushed oftl by the pressure of the moving billets. The hearth t is thus prevented from disintegrating, by expansion and contraction, when the furnace, in starting up or shutting down, is alternately heated and cooled.

I claim, Y

1. In a furnace of the class described, a hollow structure presenting an inclined surface for the gravity descentV of the heated articles, means for circulating a cooling medium through said structure, and means for discharging said cooling medium through said inclined surface.

2. In a furnace of the class described, an inclined support for the gravity descent of the heated articles, comprising a plurality of spaced longitudinal members, and a plurality of rows of blocks interposed in the spaces between said longitudinal members.

3. In a furnace of the class described, an inclined support for the gravity descent of the heated articles, comprising a plurality of spaced longitudinal members having sidev flanges thereon, and a plurality of rows of blocks, supported on said flanges and interposed in the spaces between said longitudinal members.

l. In a furnace of the class described, a hearth, and an inclinedsurface for the gravity descent of heated articles from said hearth, said surface comprising a plurality of longitudinal bracing members for retaining said hearth in place.

5. In a furnace of the class described, a

hearth, an inclined surface for the gravity descent of heated articles from an edge of said hearth, and a transverse supporting member for said hearth providing a retaining projection for said edge of said hearth, said supporting member receiving the thrust of said inclined surface.

6. In a furnace of the class described, a hearth, a transverse supporting member therefor, and an inclined surface for the gravity descent of heated articles from said hearth, said surface comprising a plurality of longitudinal members for bracing said transverse supporting member against movement.

7. In a furnace of the class described, a hearth, an inclined surface for the gravity descent of heated articles from an edge of said hearth, and a transverse supporting member for said hearth having a retaining projection for said edge between the same and said inclined surface, said inclined surface comprising a plurality of longitudinal members for supporting and bracing said transverse member.

8. In a furnace of the class described, a

plurality of hollow spaced inclined members, a plurality of rows of hollow blocks interposed between said members and supported thereby, means for establishing communication between said members and the blocks of one of said rows, and means for establishing communication between the corresponding blocks of all of said rows.

9. In a furance of the class described, a plurality of hollow spaced inclined members, a plurality of rows of hollow blocks interposed between said members and supported thereby, with the upper surfaces of said blocks and members iush, to form an inclined surface for the gravity descent of the heated articles, ing medium through said blocks and members, and means for discharging said cooling medium through the inclined surface formed thereby.

Dated this twentieth day of March, 1917.

WILLIAM J. BAGOT. I/Vitnesses:

CHARLES R. FITCH, A. F. FIELD, Jr.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents, Washington, D. G.

means for circulating a cool- Y 

